Speak with Eressea Dawnsinger at the Argent Tournament Grounds to become a valiant of Silvermoon.
You've proven yourself worthy of competing under the banner of Silvermoon, <name>. Now, you should speak with Eressea Dawnsinger, who leads the Silvermoon delegation. As Silvermoon's grand champion, she will enter you into the tournament on behalf of the city and oversee your training and testing as valiant.
It has been an honor working with you, <name>, and I wish you luck in the competition ahead.